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This might be dumb but my buddy had an STI that you could hear the turbo spool fairly loudly and I liked that a lot. I think he had a CAI. Is there any way I can get that sound with the stock intake. If so how and how hard is it.

And like Black-Falcon said, you can REALLY hear it w/ a bigger downpipe on the car. When I put on my TurboXS (4" bellmouth taperdown to 3") it actually got annoying after a while and I switched out to a smaller pipe